Given the 2-bit flash ADC unit with an analog sample-and-hold voltage of 2 volts shown in Figure 2.39, determine

the output bits.

Given a Butterworth type second-order anti-aliasing lowpass filter (Figure 2.35), determine the values of circuit elements if we want the filter to have a cutoff frequency of 1,000 Hz.

Given an analog signal

xðtÞ 1⁄4 5cosð2p$2; 500tÞ þ 2cosð2p$3; 200tÞ; for t ! 0

sampled at a rate of 8,000 Hz,

a. sketch the spectrum of the sampled signal up to 20 kHz;

b. sketch the recovered analog signal spectrum if an ideal lowpass filter with a cutoff frequency of 4 kHz is used to filter the sampled signal in order to recover the original signal.